I took this today at a Market public performance, competing with heaps of tourists with the same idea. Great music and good lighting too. Here's one of a few I took in RAW and did some PP in CS5, just using layers to get rid of the distracting background and darkening it to give the subject some prominence and drama.

I am not sure if this works. I'll try to rework this again but I would value some comments and suggestions from you.